Electric swivel



I Oct.'l6, 1945.- QGILBER-TsoN I l 2,387,015

ELEcTRc swIvEL Filed Oct. 5, 1943 2 Sheets-Sheet 2 INVENTOR ATTORNEY a .1:1 @44? fw@ T1 Y f Patented Oct. 16,'1945 l auf:

` QED ',STATES PATENT ,QF-FICE e ,e 1 2,387,015 f '5. e .j f Y ELECTRIC swIvEL `4 l olaffeiiberrt'son Mata'wan, N. J; pplcation Gctober 5, 195:3,4 Serial No.7r505,074il '1 claim. (C1. nsf-3374.)

My invention relates to swivels'and refers particularlyfto swivels adapted for use. in electric currents. 1 Y M VIn the Vuseof devices connected by wires to a source of electric current, the wires.. arev liable to become-.twisted during the revolution of the device, thus resulting not only in inconvenience but also to the danger -ofrbreaking the wires causing a short circuit. f Y.

Y 4The object of my.'device is means whereby the revolution orf an object vupon one end of electric wires Will rnot. twist the .WirescOnnecting the object to a source. of electric fcurren't,` but willV allow the wires to remain in an untwisted condition irrespective of any revolution to which the object may be subjected.

YThe advantages of a .device adapted for this purpose. are soevident asynot: to need further explanation.` A In theaccompanying- .drawings illustrating modified forms of my invention similar parts are designated by similar numerals. Y

Figurel is a perspective view of one form kof adevice ofl my invention. I. Y

Figure 2fi s arvertical bsection of kthe device of Figure:1. L ,Y

, rFigure 3 is a vertical section of a modified form of a device of my invention. w e i,

Figure 4 isa section through the line 4-1 of Figure 2.

Figure 5 is a sectional view of a modified means for attaching the casing sections together,

Figure 6 is a section through the line --G of Figure 2.

Figure '7 is a section through the line 1-1 of Figure 2.

Figure 8 is a perspective view of cable-holding member shown in the left hand portion of Figure 2.

Figure 9 is an enlarged perspective view of certain members of the device of Figure 2.

Figure 10 is an enlarged perspective view of certain members oi the device of Figure 2.

The particular form of my device shown in Figures l, 2, 4, 6 and 7 comprises two casing parts and 20A, identical in their construction.

The casing portion 20, which is made of nonelectric conducting material, comprises a central inwardly extended semi-annular portion 2l having peripheral anges 22, 22 forming a recess 23. Each end portion of the casing portion 20 has an enlarged portion 211 having a peripheral flange 25 forming a recess 26. Positioned within the recess 23 of the member 2| is an annular member 21 of electric-conducting material having perpheral iianges 28 and 29 forming a recess For purposes of clearnessfo'f description it will be assumed that the -electric `current enters the right: end of the devicefreferred to as vthe entrance" end, and passes out of the left end of the device referred to as the'exitend of the device, as 'indicated by the arrows yiin Figure 1. l

Positioned in Vthe-exit end portion of the device is a rod `S -of electric-conductingmaterial having the enlarged end portion 3l. An annular member 32^Ahas the outwardly extended fla-nge 33 abuttable 4'upon 'the iiange 23 of the member 21; the rod`-3 andthe `member V32 being separated by the non-conducting material 3Q. A i Positioned within -the'space formed by the'annual' member- 2l-is anI annular non-conducting memberhaving the'enlarged` portion 35 abutting upon vthe'inner face of the member 21 and an annular portion 36 spaced from the inner face of the member 21, said portionvhaving the inwardly 'directed flange 31.'V

Positioned within the `non-conducting member 35 is an annular hollow electric-conducting Vmem'- ber '38, one endof which has the ange 39 so adapted vas to allow the member 3! of the rod 3i) tofabut uponthe inner face thereof. A threaded 'plugff closure -Misvcap'able of meshing with the interiorlthreadedopen end of 'the member''.V A coil spring il maintains the flange 33 of the member 32 in contact with the flange 28 of the member 21 and a coil spring 42 maintains the end members 3l of the rod 30 in contact with the flange 39 of the member 3B.

One wire 43 from a source of electric current is connected at 44 to the member 29 of the member 21 and the other wire 45 from said electric source is connected at 46 to the plug 40.

An outgoing wire 41 is connected at 48 with the rod 30 and the other wire 49 is connected at 50 to the member 32.

The two cables 5| and 52 carrying these two sets of wires, respectively, pass through openings in each end of the device and are revoluble with the bushings 53 and 511, said bushings being maintained in position by the extended portions entering recesses in the end members 24, 24A.

The two portions of the casing may be attached to each other by welding or by any other suitable means.

It will be noted that the current will enter through the wire 43 and pass through member 21 and member 32 and thence outwardly through the wire 49; and' that the current will also enter through the wire 45, through the member 38 and the rod 30 and thence outwardly through the Wire 41.

If the entering Wires 43 and 45 remain stationary with respect to the casing, the members 21 and 38 will also remain stationary thereto, and then if the cable 52 be revolved within the exit end members of the casing, the rod 30 will still be incontact with the member 38 and the member 32 will `still be in contact with the member 21.

The turning or twisting of the cable 5 2, IVtherefore, will turn. the :rod 30 and the member 32 while retaining contact with the incoming current members 21 and 38, and hence, the turning or twisting of the cable 52 will not turn or twis the cable 5|.

The same effect win be obtained if the now of the current be reversed.

The described device assembledrasfollows: ,the tubular member 32 with its ange 33 is first inserted into tubular member 21, the spring '4| is then threaded therein and the assembly comprising parts 30, 34, 38 and 35 are inserted by lining upv the longitudinal slots 1| and 12 with corresponding lugs 13 `and 14 which is accomplished by lpressure against thel tension of spring 4|. When therear edge of 35 is linserted beyond the inneredges of lugs 13 and 14, it is given a turn so that slots 1| and 12 areoutrof alignment with thelugs 13 and 14, thus preventing the assembly members from falling out of the device.

'I 'he interior construction ofthe modified form of adevice of my invention as shown in Figure 3 is similar to that shown in Figures 1 and 2, the only Vdifference being in the construction of the casing.` Y

Inthis form of my device the casing is divided vertically instead of longitudinally into two parts |30- and 6|, which parts are maintained in removable position to each other by the annular member 62, a part on the inner portion of which is threaded at 63 to co-operate with the threaded portion 64 of the casing 6|, While the other inner portion of the member 62 carries a recess to receive the flange 65 of the casing 60. Y

Figure 5 illustrates a modified'form of attaching the casings 20 and 20A which comprises a 1 recess in 15 inthe casing 20 to receive a set screw 15 passing into and threada'ble-with an opening in casing 20A, a number of such securing means being employed.

A valuable feature of my device is its adaptability When it is necessary that the operating device be revolved during the application of an electric current thereto.

It will thus be seen that my invention presents devices which, if placed in an electric circuit between the source of supply and the device to be operated, will prevent the twisting of the wires when the operating device is related or revolved, thusovercorning the dangerzand inconvenience incident thereto. f e

I do`not limit myself' to the'p'articular size, shape, number or arrangement of parts as these are mentioned for the sole purpose of clearly .describing my invention.

What I claim is: An exterior casing of dielectric material, a tubular memberV `of current conducting material having an inwardly flanged end opening at one end'thereof within said casing, a second tubular member of dielectric material having a Vflanged endopeningat one end thereof within said first mentioned tubular member, dielectric material positioned betweensaid tvvoI tubular members, an outwardly vextended tubular` memberfof currentfconducting material having a nanged end opening at one end thereof, spring means within said rst mentioned ,tubularmember revolubly abutting the flange of said rst mentioned tubularV member and said outwardly extendedtubular member, ay rod of current conducting 'ma-A terial positioned within said extended .tubular member, a current dielectric material positioned between said rod Vand said extended tubular. member, an annular enlarged endportion of said rod positioned within said inner vtubular member, spring means within said inner tubular member revolubly abutting the said rod and the flange of saigl inner tubular member, means carried by said first mentioned tubular Ymein-ber adapted to be connected to a source of electric current, and means carried by said inner tubular member adapted to be vconnected to a-source of electric current, means carried by said .extended 

